I usually find when that is happening, something is clobbering the
system, very short, very fast, and gone again. Try using htop -d 1 and
watching it closely during that stall to see what you see pegging
resources. IOwait can be an issue too for that if you have slow disks
with something short/fast accessing a chunk of data.
I don't notice so much anymore this with 2+ cores on a desktop, but this
is/was common for single-core/thead devices (like my android).
-mb
On 05/25/2013 11:59 AM, Mark Phillips wrote:
> I have an old headless server running Linux version 2.6.32-5-686 (Debian
> 2.6.32-48squeeze1) (dannf@debian.org <mailto:dannf@debian.org>) (gcc
> version 4.3.5 (Debian 4.3.5-4) ). Recently, when I log in using ssh the
> terminal window freezes for a few seconds, then usually comes back. The
> command line stops printing the characters I am typing, the cursor stops
> blinking, and then after a few seconds, it comes back. This happens
> every few minutes, so it is becoming rather annoying.
>
> When I check the disks, I get
> # df -h
> Filesystem Size Used Avail Use% Mounted on
> /dev/sda1 182G 42G 131G 25% /
> tmpfs 505M 0 505M 0% /lib/init/rw
> udev 500M 140K 500M 1% /dev
> tmpfs 505M 0 505M 0% /dev/shm
> /dev/sdb1 230G 146G 72G 67% /mnt/sdb
>
> So I am not running out of disk space.
>
> When I run top, I get this output:
> Tasks: 90 total, 3 running, 87 sleeping, 0 stopped, 0 zombie
> Cpu(s): 7.0%us, 3.0%sy, 0.0%ni, 82.7%id, 6.6%wa, 0.3%hi, 0.3%si,
> 0.0%st
> Mem: 1032748k total, 1013748k used, 19000k free, 242992k buffers
> Swap: 2017272k total, 1040k used, 2016232k free, 473584k cached
>
> So I am not running a process that is taking over the CPU.
>
> How should I go about diagnosing this problem?
>
> Thanks!
>
> Mark
>
>
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